Blank holder



FIG. 1 is a perspective view of a blank holder, showing my new design

FIG. 2 is a bottom view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The dotted lines form no part of the claimed design. 

CLAIM The ornamental design for a blank holder, as shown and described. 